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-rw-r--r--libtomcrypt/math/ltm_desc.c483
1 files changed, 483 insertions, 0 deletions
diff --git a/libtomcrypt/math/ltm_desc.c b/libtomcrypt/math/ltm_desc.c
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+++ b/libtomcrypt/math/ltm_desc.c
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+/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+ *
+ * LibTomCrypt is a library that provides various cryptographic
+ * algorithms in a highly modular and flexible manner.
+ *
+ * The library is free for all purposes without any express
+ * guarantee it works.
+ *
+ * Tom St Denis, tomstdenis@gmail.com, http://libtom.org
+ */
+
+#define DESC_DEF_ONLY
+#include "tomcrypt.h"
+
+#ifdef LTM_DESC
+
+#include <tommath.h>
+
+static const struct {
+ int mpi_code, ltc_code;
+} mpi_to_ltc_codes[] = {
+ { MP_OKAY , CRYPT_OK},
+ { MP_MEM , CRYPT_MEM},
+ { MP_VAL , CRYPT_INVALID_ARG},
+};
+
+/**
+ Convert a MPI error to a LTC error (Possibly the most powerful function ever! Oh wait... no)
+ @param err The error to convert
+ @return The equivalent LTC error code or CRYPT_ERROR if none found
+*/
+static int mpi_to_ltc_error(int err)
+{
+ int x;
+
+ for (x = 0; x < (int)(sizeof(mpi_to_ltc_codes)/sizeof(mpi_to_ltc_codes[0])); x++) {
+ if (err == mpi_to_ltc_codes[x].mpi_code) {
+ return mpi_to_ltc_codes[x].ltc_code;
+ }
+ }
+ return CRYPT_ERROR;
+}
+
+static int init(void **a)
+{
+ int err;
+
+ LTC_ARGCHK(a != NULL);
+
+ *a = XCALLOC(1, sizeof(mp_int));
+ if (*a == NULL) {
+ return CRYPT_MEM;
+ }
+
+ if ((err = mpi_to_ltc_error(mp_init(*a))) != CRYPT_OK) {
+ XFREE(*a);
+ }
+ return err;
+}
+
+static void deinit(void *a)
+{
+ LTC_ARGCHKVD(a != NULL);
+ mp_clear(a);
+ XFREE(a);
+}
+
+static int neg(void *a, void *b)
+{
+ LTC_ARGCHK(a != NULL);
+ LTC_ARGCHK(b != NULL);
+ return mpi_to_ltc_error(mp_neg(a, b));
+}
+
+static int copy(void *a, void *b)
+{
+ LTC_ARGCHK(a != NULL);
+ LTC_ARGCHK(b != NULL);
+ return mpi_to_ltc_error(mp_copy(a, b));
+}
+
+static int init_copy(void **a, void *b)
+{
+ if (init(a) != CRYPT_OK) {
+ return CRYPT_MEM;
+ }
+ return copy(b, *a);
+}
+
+/* ---- trivial ---- */
+static int set_int(void *a, unsigned long b)
+{
+ LTC_ARGCHK(a != NULL);
+ return mpi_to_ltc_error(mp_set_int(a, b));
+}
+
+static unsigned long get_int(void *a)
+{
+ LTC_ARGCHK(a != NULL);
+ return mp_get_int(a);
+}
+
+static unsigned long get_digit(void *a, int n)
+{
+ mp_int *A;
+ LTC_ARGCHK(a != NULL);
+ A = a;
+ return (n >= A->used || n < 0) ? 0 : A->dp[n];
+}
+
+static int get_digit_count(void *a)
+{
+ mp_int *A;
+ LTC_ARGCHK(a != NULL);
+ A = a;
+ return A->used;
+}
+
+static int compare(void *a, void *b)
+{
+ int ret;
+ LTC_ARGCHK(a != NULL);
+ LTC_ARGCHK(b != NULL);
+ ret = mp_cmp(a, b);
+ switch (ret) {
+ case MP_LT: return LTC_MP_LT;
+ case MP_EQ: return LTC_MP_EQ;
+ case MP_GT: return LTC_MP_GT;
+ }
+ return 0;
+}
+
+static int compare_d(void *a, unsigned long b)
+{
+ int ret;
+ LTC_ARGCHK(a != NULL);
+ ret = mp_cmp_d(a, b);
+ switch (ret) {
+ case MP_LT: return LTC_MP_LT;
+ case MP_EQ: return LTC_MP_EQ;
+ case MP_GT: return LTC_MP_GT;
+ }
+ return 0;
+}
+
+static int count_bits(void *a)
+{
+ LTC_ARGCHK(a != NULL);
+ return mp_count_bits(a);
+}
+
+static int count_lsb_bits(void *a)
+{
+ LTC_ARGCHK(a != NULL);
+ return mp_cnt_lsb(a);
+}
+
+
+static int twoexpt(void *a, int n)
+{
+ LTC_ARGCHK(a != NULL);
+ return mpi_to_ltc_error(mp_2expt(a, n));
+}
+
+/* ---- conversions ---- */
+
+/* read ascii string */
+static int read_radix(void *a, const char *b, int radix)
+{
+ LTC_ARGCHK(a != NULL);
+ LTC_ARGCHK(b != NULL);
+ return mpi_to_ltc_error(mp_read_radix(a, b, radix));
+}
+
+/* write one */
+static int write_radix(void *a, char *b, int radix)
+{
+ LTC_ARGCHK(a != NULL);
+ LTC_ARGCHK(b != NULL);
+ return mpi_to_ltc_error(mp_toradix(a, b, radix));
+}
+
+/* get size as unsigned char string */
+static unsigned long unsigned_size(void *a)
+{
+ LTC_ARGCHK(a != NULL);
+ return mp_unsigned_bin_size(a);
+}
+
+/* store */
+static int unsigned_write(void *a, unsigned char *b)
+{
+ LTC_ARGCHK(a != NULL);
+ LTC_ARGCHK(b != NULL);
+ return mpi_to_ltc_error(mp_to_unsigned_bin(a, b));
+}
+
+/* read */
+static int unsigned_read(void *a, unsigned char *b, unsigned long len)
+{
+ LTC_ARGCHK(a != NULL);
+ LTC_ARGCHK(b != NULL);
+ return mpi_to_ltc_error(mp_read_unsigned_bin(a, b, len));
+}
+
+/* add */
+static int add(void *a, void *b, void *c)
+{
+ LTC_ARGCHK(a != NULL);
+ LTC_ARGCHK(b != NULL);
+ LTC_ARGCHK(c != NULL);
+ return mpi_to_ltc_error(mp_add(a, b, c));
+}
+
+static int addi(void *a, unsigned long b, void *c)
+{
+ LTC_ARGCHK(a != NULL);
+ LTC_ARGCHK(c != NULL);
+ return mpi_to_ltc_error(mp_add_d(a, b, c));
+}
+
+/* sub */
+static int sub(void *a, void *b, void *c)
+{
+ LTC_ARGCHK(a != NULL);
+ LTC_ARGCHK(b != NULL);
+ LTC_ARGCHK(c != NULL);
+ return mpi_to_ltc_error(mp_sub(a, b, c));
+}
+
+static int subi(void *a, unsigned long b, void *c)
+{
+ LTC_ARGCHK(a != NULL);
+ LTC_ARGCHK(c != NULL);
+ return mpi_to_ltc_error(mp_sub_d(a, b, c));
+}
+
+/* mul */
+static int mul(void *a, void *b, void *c)
+{
+ LTC_ARGCHK(a != NULL);
+ LTC_ARGCHK(b != NULL);
+ LTC_ARGCHK(c != NULL);
+ return mpi_to_ltc_error(mp_mul(a, b, c));
+}
+
+static int muli(void *a, unsigned long b, void *c)
+{
+ LTC_ARGCHK(a != NULL);
+ LTC_ARGCHK(c != NULL);
+ return mpi_to_ltc_error(mp_mul_d(a, b, c));
+}
+
+/* sqr */
+static int sqr(void *a, void *b)
+{
+ LTC_ARGCHK(a != NULL);
+ LTC_ARGCHK(b != NULL);
+ return mpi_to_ltc_error(mp_sqr(a, b));
+}
+
+/* div */
+static int divide(void *a, void *b, void *c, void *d)
+{
+ LTC_ARGCHK(a != NULL);
+ LTC_ARGCHK(b != NULL);
+ return mpi_to_ltc_error(mp_div(a, b, c, d));
+}
+
+static int div_2(void *a, void *b)
+{
+ LTC_ARGCHK(a != NULL);
+ LTC_ARGCHK(b != NULL);
+ return mpi_to_ltc_error(mp_div_2(a, b));
+}
+
+/* modi */
+static int modi(void *a, unsigned long b, unsigned long *c)
+{
+ mp_digit tmp;
+ int err;
+
+ LTC_ARGCHK(a != NULL);
+ LTC_ARGCHK(c != NULL);
+
+ if ((err = mpi_to_ltc_error(mp_mod_d(a, b, &tmp))) != CRYPT_OK) {
+ return err;
+ }
+ *c = tmp;
+ return CRYPT_OK;
+}
+
+/* gcd */
+static int gcd(void *a, void *b, void *c)
+{
+ LTC_ARGCHK(a != NULL);
+ LTC_ARGCHK(b != NULL);
+ LTC_ARGCHK(c != NULL);
+ return mpi_to_ltc_error(mp_gcd(a, b, c));
+}
+
+/* lcm */
+static int lcm(void *a, void *b, void *c)
+{
+ LTC_ARGCHK(a != NULL);
+ LTC_ARGCHK(b != NULL);
+ LTC_ARGCHK(c != NULL);
+ return mpi_to_ltc_error(mp_lcm(a, b, c));
+}
+
+static int mulmod(void *a, void *b, void *c, void *d)
+{
+ LTC_ARGCHK(a != NULL);
+ LTC_ARGCHK(b != NULL);
+ LTC_ARGCHK(c != NULL);
+ LTC_ARGCHK(d != NULL);
+ return mpi_to_ltc_error(mp_mulmod(a,b,c,d));
+}
+
+static int sqrmod(void *a, void *b, void *c)
+{
+ LTC_ARGCHK(a != NULL);
+ LTC_ARGCHK(b != NULL);
+ LTC_ARGCHK(c != NULL);
+ return mpi_to_ltc_error(mp_sqrmod(a,b,c));
+}
+
+/* invmod */
+static int invmod(void *a, void *b, void *c)
+{
+ LTC_ARGCHK(a != NULL);
+ LTC_ARGCHK(b != NULL);
+ LTC_ARGCHK(c != NULL);
+ return mpi_to_ltc_error(mp_invmod(a, b, c));
+}
+
+/* setup */
+static int montgomery_setup(void *a, void **b)
+{
+ int err;
+ LTC_ARGCHK(a != NULL);
+ LTC_ARGCHK(b != NULL);
+ *b = XCALLOC(1, sizeof(mp_digit));
+ if (*b == NULL) {
+ return CRYPT_MEM;
+ }
+ if ((err = mpi_to_ltc_error(mp_montgomery_setup(a, (mp_digit *)*b))) != CRYPT_OK) {
+ XFREE(*b);
+ }
+ return err;
+}
+
+/* get normalization value */
+static int montgomery_normalization(void *a, void *b)
+{
+ LTC_ARGCHK(a != NULL);
+ LTC_ARGCHK(b != NULL);
+ return mpi_to_ltc_error(mp_montgomery_calc_normalization(a, b));
+}
+
+/* reduce */
+static int montgomery_reduce(void *a, void *b, void *c)
+{
+ LTC_ARGCHK(a != NULL);
+ LTC_ARGCHK(b != NULL);
+ LTC_ARGCHK(c != NULL);
+ return mpi_to_ltc_error(mp_montgomery_reduce(a, b, *((mp_digit *)c)));
+}
+
+/* clean up */
+static void montgomery_deinit(void *a)
+{
+ XFREE(a);
+}
+
+static int exptmod(void *a, void *b, void *c, void *d)
+{
+ LTC_ARGCHK(a != NULL);
+ LTC_ARGCHK(b != NULL);
+ LTC_ARGCHK(c != NULL);
+ LTC_ARGCHK(d != NULL);
+ return mpi_to_ltc_error(mp_exptmod(a,b,c,d));
+}
+
+static int isprime(void *a, int *b)
+{
+ int err;
+ LTC_ARGCHK(a != NULL);
+ LTC_ARGCHK(b != NULL);
+ err = mpi_to_ltc_error(mp_prime_is_prime(a, 8, b));
+ *b = (*b == MP_YES) ? LTC_MP_YES : LTC_MP_NO;
+ return err;
+}
+
+const ltc_math_descriptor ltm_desc = {
+
+ "LibTomMath",
+ (int)DIGIT_BIT,
+
+ &init,
+ &init_copy,
+ &deinit,
+
+ &neg,
+ &copy,
+
+ &set_int,
+ &get_int,
+ &get_digit,
+ &get_digit_count,
+ &compare,
+ &compare_d,
+ &count_bits,
+ &count_lsb_bits,
+ &twoexpt,
+
+ &read_radix,
+ &write_radix,
+ &unsigned_size,
+ &unsigned_write,
+ &unsigned_read,
+
+ &add,
+ &addi,
+ &sub,
+ &subi,
+ &mul,
+ &muli,
+ &sqr,
+ &divide,
+ &div_2,
+ &modi,
+ &gcd,
+ &lcm,
+
+ &mulmod,
+ &sqrmod,
+ &invmod,
+
+ &montgomery_setup,
+ &montgomery_normalization,
+ &montgomery_reduce,
+ &montgomery_deinit,
+
+ &exptmod,
+ &isprime,
+
+#ifdef LTC_MECC
+#ifdef LTC_MECC_FP
+ &ltc_ecc_fp_mulmod,
+#else
+ &ltc_ecc_mulmod,
+#endif
+ &ltc_ecc_projective_add_point,
+ &ltc_ecc_projective_dbl_point,
+ &ltc_ecc_map,
+#ifdef LTC_ECC_SHAMIR
+#ifdef LTC_MECC_FP
+ &ltc_ecc_fp_mul2add,
+#else
+ &ltc_ecc_mul2add,
+#endif /* LTC_MECC_FP */
+#else
+ NULL,
+#endif /* LTC_ECC_SHAMIR */
+#else
+ NULL, NULL, NULL, NULL, NULL,
+#endif /* LTC_MECC */
+
+#ifdef LTC_MRSA
+ &rsa_make_key,
+ &rsa_exptmod,
+#else
+ NULL, NULL
+#endif
+};
+
+
+#endif
+
+/* $Source: /cvs/libtom/libtomcrypt/src/math/ltm_desc.c,v $ */
+/* $Revision: 1.31 $ */
+/* $Date: 2007/05/12 14:32:35 $ */
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